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? for those of you who have sliding headstocks.....

Discussion in 'Woodturning Discussion Forum' started by odie, Nov 22, 2017.

  1. Owen Lowe

    Owen Lowe

    Joined:
    Oct 25, 2005
    Messages:
    755
    Location:
    Newberg, OR: 20mi SW of Portland: AAW #21058
    I turned on a Laguna 1836 this past summer. The bed is welded steel but the legs are cast iron.

    Totally agree here. A spindle lock shouldn’t require constant hand contact to stay engaged. There are just too many activities where I need both hands while the spindle is locked. Using the indexing pin as a lock was inconvenient as it’s not very fast to engage or disengage. I also became frustrated that the speed wouldn’t go down as slow as I am used to. As I recall, 50rpm +/- was the slowest the lathe would go. There were a couple of other frustrations, but I attribute those more to complete familiarity and a long partnership with my differently branded lathe.
     
    William Rogers likes this.
  2. Gerald Lawrence

    Gerald Lawrence

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    Feb 6, 2010
    Messages:
    765
    Location:
    Brandon, MS
    No comment on most of the experience here. Just a comment on Bill's first post. Logic would suggest that if the headstock was placed in the middle of the bed harmonic vibration would be increased, but I have no way to determine how much. Also note not everyone has that acute sense of touch Odie does so may not feel that vibration.
     
    William Rogers likes this.
  3. Jon Minerich

    Jon Minerich

    Joined:
    Dec 26, 2011
    Messages:
    41
    Location:
    Biloxi, Mississippi
    Thanks Bill,
    Maybe someday we will all be turning on a Robust! Until then I am saving my money for classes.
     
  4. odie

    odie

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    Panning for Montana gold!
    Well, I don't think I have super powers, and Marvel comics just hasn't found me yet! :D.......however, I think my sense of feel is something that is developed, and doesn't really have mystical origins. o_O It's a matter of learning to recognize, and concentrate on the input data. That input data is very subtle, and could be easily missed without the learning process it takes to acquire the sense.

    It makes sense to me that a sliding headstock is likely to have more vibration centrally located between the legs.....and, I hadn't thought to apply that to where the best place to put you fingers on the bedways would be, in order to detect vibration. I just happened to be applying that theory by accident.......so, if I were to try and relay the process with the written word, I would say use a very light touch on a central location of the bedways.....then practice the concept.

    There are other indicators of vibration on my lathe......four goose neck lamps, a couple extended arms for micro lights and a laser pointer. These things also help. Your sense of hearing comes into play here, too! if it helps, use all the sources of information available to you.

    As far as Al Hockenbery's suggestion of the half full water bottle......I've done a little contemplating about that since my last comment......and, the theory may be something that can be refined a bit. I do like the overall theory. My idea of using a thinner liquid, such as alcohol might help.....it deserves to be explored. It might work, and it might not, but there really is only one way to find out. :D It is possible that a tall bottle might not be the best platform to detect small vibrations......and a short & wide holder might work out better.......so, that the surface of the liquid is spread out over a larger area......

    Anyway, it's easy to make snap judgments about things......and not fully explore the hypothesis. ;)....and, I plead guilty! :eek:

    -----odie-----
     
  5. William Rogers

    William Rogers

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    Mar 19, 2016
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    Location:
    Haubstadt, Indiana
    Odie, I think your approach to vibration is the most practical. Do we feel it or not. We turn wood that has voids and density differences that contribute to vibration.
     
    odie likes this.
  6. hockenbery

    hockenbery AAW Advisor Staff Member

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    Kelly,
    I just listen and watch as I tune the speed.

    I suggested a process to measure vibration for different headstock positions.
    A process to measure big vibration from a 50lb blank with the headsock
    1 Above a leg set
    2 in the middle of the bed

    :) you could visit someone with a sliding headstock and use your fingers with the headstock in both positions and record the lathe speed :)
     
    Bill Boehme and odie like this.
  7. James Seyfried

    James Seyfried

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    Jan 7, 2012
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    Michigan
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    I have a PM3520B with the extension bed and it does seem more stable positioned near the end to me. I don't know if the extension makes a difference, but I did notice a difference when I first got the lathe, if I had the headstock in the center. Not much difference, but enough that I agree with the video claim.
     

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